peakchem
Fluorescent Brightener-OB-1(C.I.393)

Chemical name: 2.2'-(4.4'-diphenol vinyl)dibenzoxazol 
Molecular formula: C28H18N2O2
Molecular weight: 414
Properties: Fluorescent brightener is yellow crystals. Its melting point is 351-353,and it is not-water-soluble,and odorless, enjoying stable performance and strong fluorescence. Its maximum wavelength of absorption spectrum is 374 and its emitting wavelength of fluorescence is 434 nm. 
Appearance: Yellow crystal powder 
Melting Point: 351-353'C
Assay: 99.6% 
Fineness: passing through 200 meshes 
Package: 10kgs Drum

Fluorescent brightener OB-1 (C.I.393) is used in increasing whiteness of original polyester.

 Special Recommending:
Fluorescent Brightener  CBS    (C.I.351)
 Fluorescent Brightener   PF   (C.I.135)
 Fluorescent Brightener   ER   (C.I.199)
 Fluorescent Brightener-OB   (C.I.184)
 Fluorescent Brightener-OB-1  (C.I.393)
 Fluorescent Brightener-OB-3   (C.I.368)